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Dual
wavelength waveplates are multi-order waveplates designed to simultaneously
meet specific retardances at two different wavelengths. Dual wavelength
waveplates have been used in second harmonic generation (SHG) lasers and
optical parametric oscillators (OPO) where it is sometimes useful to have
separate polarization states for the fundamental and the harmonic beams.
Dual
wavelength waveplates are designed for a thickness that optimally meets
the design retardances of the two wavelengths to within a certain precision.
We have developed models to design and accurately predict the performance
of dual wavelength waveplates. Most common are the 1064nm / 532nm designs
for SHG Nd:Yag and Nd:YVO4 lasers. We have standard designs for these
two wavelengths as well as others.
Achromatic Circular Polarizer (Tri-Wave Broadband Quarter Waveplate)
This type of Achromatic Waveplate is constructed of Quartz and MgF2.
This Achromatic Waveplate provides the retardation for producing quarter
wave phase difference at three wavelengths, 406 nm, 660nm and 790nm, in
a single plate. These three wavelengths are commonly used as light sources
in the optical reading/writing head, which is suitable for applications
in CDP, DVDP, Blue-ray DVD OPU, CD-ROM.
